A Fox News host was ambushed while attending her pal’s campaign event in Brooklyn Monday night — doused head to toe with a bottle of water.

The assault against Kat Timpf, a libertarian co-host on “Fox News Specialists,” occurred at Union Pool in Williamsburg, where her friend and Brooklyn Borough president hopeful Ben Kissel was hosting the event, which coincided with his birthday.

A still shaken Timpf told The Post Tuesday ​that she was definitely targeted for the ​​attack.

“This was a pre-planned thing,” Timpf said. “Just to see someone look you in the eye with that kind of anger and hatred and whip water in your face … is a terrifying thought.”

Timpf said the man was silent ​as he tapped her on the shoulder, dumped water on her head and then splashed it into her eyes. She said the unprovoked incident forced her to cancel her speech at Kissel’s event about criminal justice reform and budget cuts.

“The way things have gotten, it’s just so sick,” she said. “I don’t even have a right to exist in public is how it feels.”

The 28-year-old commentator chronicled the “infantile bulls–t” in a fired up tweetstorm.

The unknown guy “walks in, clearly here because he knows I’m here, dumps an entire 1.5 liter bottle of water on me, first on my head and then I turn … to look and he splashes it directly on my face and runs out. I’m shocked, I’m stunned. I’m obviously upset. I end up not being able … to speak because of it,” Timpf wrote Monday night.

She went on to add, “I’ve never seen a more disgusting insane cruel climate than the one we’re in now. Why? What does that … accomplish? I guess I wasn’t able to speak so that’s great and I guess he wins, but we’re just randomly assaulting people in public now?”

The altercation was caught on security footage, which Timpf said has been turned over to police. She also filed a police report — but the assailant is still in the wind, she said on Twitter.

Police confirmed Timpf filed a harassment complaint Monday night. They described the creep, who said nothing when he attacked, as a 6’2 black male, about 170 lbs. with dreadlocks.

Meanwhile, Kissel, who hopes to unseat incumbent Eric Adams, tweeted support for his friend.

“Disgusted by the actions of an obvious lunatic at my campaign event. We can do better than this,” he wrote.

Timpf also got a boost from her Fox colleague Geraldo Rivera and CNN anchor Jake Tapper.

“Dude that blindsided @KatTimpf is a piece of s–t. Want to meet him someday,” Rivera tweeted.

Tapper wrote, “That is unacceptable and disgusting. I’m sorry you went thought that. He was a coward and a loser. Stay strong.”